/Engine/Plugins/Experimental/GeometryScripting/Source/GeometryScriptingCore/Public/GeometryScript/PolyPathFunctions.h
Create an open arc on the XY plane around the given Center. As it is an open path, the end vertex exactly hits the target EndAngle (so will be positioned on the start vertex if the end aligns to the start)
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category="GeometryScript|PolyPath") static [FGeometryScriptPolyPath](API\Plugins\GeometryScriptingCore\GeometryScript\FGeometryScriptPolyPath) CreateArcPath2D ( FVector2D Center, float Radius, int NumPoints, float StartAngle, float EndAngle )